Chip removal device and removal method

Abstract

To remove disk-like chips which are generated on an outlet side of a drill hole simultaneously with completion of processing of the drill hole.SOLUTION: A chip removal device removes disk-like chips BR which are generated on an outlet side of a drill hole H when processing the drill hole H in a work-piece (H-shaped steel). The device has an abutment member B that contacts the disk-like chips BR on the outlet side of the frill hole H.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a chip removal device and a chip removal method for removing disc-shaped chips generated at the exit side of a drill hole. [Background technology]

[0002] In architectural structures that use H-shaped steel, bolted joints are often used, such as beams joined with high-strength bolt friction joints. Figure 8(a)(b)(c) shows a state of a beam joined with a high-strength bolt friction joint, in which a beam 3 is bolted to the end of a beam 2 at a joint between an H-shaped steel column 1 and a beam 2 using multiple bolts 4 and a splice plate 5.

[0003] In such bolt joints, it is necessary to drill multiple holes in the flanges, webs, etc. of the H-shaped steel. Figure 9 shows a conventional method for drilling holes H into an H-shaped steel W.

[0004] When drilling holes H into the flanges or webs of H-shaped steel W, disk-shaped (scab-like) chips BR are generated on the exit side of the drill hole H. Such chips BR often remain attached to the exit side of the drill hole H.

[0005] When H-beam W is post-treated by shot blasting, most of the chips BR fall off. However, the chips BR that fall off may get mixed in with the shot balls and cause the shot ball filters (separators or screens) to become clogged, which may have a detrimental effect on the equipment in the next process. Note that a search for related prior art documents was conducted on the patent information platform (J-PlatPat), but none were found. [Prior art documents] [Patent documents]

[0006] none Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to remove disk-shaped chips generated on the exit side of a drill hole simultaneously with the completion of drilling of the hole. [Means for solving the problem]

[0008] In order to solve the above problems, the chip removal device of the present invention is a chip removal device that removes disk-shaped chips that are generated on the outlet side of a drill hole when drilling a hole in a workpiece, and is characterized in having a support member that abuts against the disk-shaped chips on the outlet side of the drill hole.

[0009] In addition, the chip removal method of the present invention is a chip removal method for removing disk-shaped chips that are generated on the exit side of a drill hole when machining a drill hole in a workpiece, and is characterized in that a stop member is brought into contact with the disk-shaped chips at the exit side of the drill hole. Effect of the Invention

[0010] According to the present invention, disk-shaped chips generated on the exit side of the drill hole can be removed simultaneously with the completion of drilling the hole. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram showing a state in which an H-shaped steel is drilled using the chip removal device according to one embodiment of the present invention. [Diagram 2] FIG. 1 is a diagram showing types of drills. [Diagram 3] FIG. 1 is a diagram showing the process of disk-shaped chips being generated at the exit side of a drill hole. [Figure 4] 1 is a diagram showing the principle of a chip removing device according to an embodiment of the present invention; [Diagram 5] FIG. 11 is a diagram showing a chip removal device according to another embodiment of the present invention. [Figure 6] FIG. 13 is a diagram illustrating an example in which a chip removal device is supported on a drill head. [Figure 7]FIG. 13 is a diagram showing the state in which a flange of an H-shaped steel is drilled using a chip removal device. [Figure 8] FIG. 13 is a perspective view, a side view, and a plan view showing the bolt connection of a beam at a column-beam joint. [Figure 9] 1A to 1C are diagrams showing a conventional method for drilling holes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Fig. 1 is a diagram showing drilling an H-shaped steel using a chip removal device according to one embodiment of the present invention. Fig. 1(a) and (b) show drilling of left and right flanges, and Fig. 1(c) shows drilling of a web between the left and right flanges.

[0013] As shown in the figure, a backing member B serving as a chip removal device is movably disposed on the outlet side of a drill hole H. This backing member B is movably disposed so as to maintain a predetermined gap between itself and the tip end of a drill D when drilling is completed.

[0014] The predetermined gap CL is a gap at which an end of the disk-shaped chip BR abuts against the backing member B when the disk-shaped chip BR opens at a predetermined angle θ. Here, the predetermined angle θ is an angle less than 90° (θ<90°).

[0015] Figure 2 shows the types of drills used in drilling. Drill D in Figure 2(a) is a general-purpose drill with a cutting edge angle θ of 118°. Drill D in Figure 2(b) is a drill for machining thin plates with a cutting edge angle θ of 160°.

[0016] In order to improve the machining accuracy and dimensional accuracy of drill hole H, it is desirable to use a drill with a large cutting edge angle θ so that the outer periphery of drill D starts cutting the entrance face of drill hole H before the tip of drill D reaches the exit face of the drill hole, as shown in Figure 2(b). However, when the cutting edge angle θ is made large in this way, disk-shaped chips are more likely to be generated.

[0017] In the case of a drill with a large cutting edge angle θ, the axial position of the tip of the drill D approaches the axial position of the outer periphery of the drill D. As a result, just before the tip of the drill D reaches the exit face of the drill hole H, the remaining material thickness that the drill D continues to cut becomes thinner, and the strength of the material thickness decreases, making it more susceptible to plastic deformation.

[0018] As the drill D continues to cut, the remaining material thickness, whose strength has been reduced, is pushed by the thrust of the drill D, undergoes plastic deformation, and is cut away while being pushed toward the exit of the drill hole H. For this reason, even when the outer periphery of the drill D reaches the exit face of the drill hole H, the remaining material is not completely cut away and remains in a thin layer as a disk-shaped chip BR.

[0019] Figure 3 shows the process by which the chip BR is generated in sequence. The chip BR is generated regardless of whether or not an oxide layer Wa is present, but here we show an example in which an oxide layer Wa is present.

[0020] Figure 3(a) shows the state in which the oxide film Wa is plastically deformed by being pressed by the tip of drill D at the exit side of drill hole H. At this time, the oxide film Wa is cut into a circular shape by the outer periphery of drill D. However, the periphery of the oxide film Wa is not completely cut into a circular shape, and a disk-shaped chip BR is generated due to elastic and plastic deformation as shown in Figures 3(b) and (c).

[0021] This chip BR often remains with part of its periphery connected to the exit side of the drill hole H. Even if the drill hole H penetrates through and the tip of the drill protrudes toward the exit side as shown in Figure 3(c), the chip BR remains open at an angle of more than 90°.

[0022] Therefore, in the chip removal device of this embodiment, a backing member B is disposed on the exit side of the drill hole H as shown in Figures 4(a) and 4(b). The gap CL between the exit side of the drill hole H and the backing member B is set to a distance that remains in the range of angle θ<90, where θ is the angle at which the chips BR open. Therefore, if the diameter of the chips BR is DM, then the gap CL is smaller than the diameter DM.

[0023] As a result, the tip of the chip BR comes into contact with the backing member B in a state where the chip BR opens at an acute angle. That is, the tip of the chip BR comes into contact with the backing member B in a state where the opening angle of the chip BR is less than 90 degrees.

[0024] By disposing the contact member B in this manner, the tip of the chip BR can be fixed in place by contacting it with the contact member B in a state in which the tip of the chip BR is open at an angle of less than 90°. Therefore, the outer periphery of the drill D can forcibly cut off the base end (rotation fulcrum) of the disk-shaped chip BR.

[0025] If the opening angle θ of the chip BR is 90° or more, the tip of the chip BR cannot be brought into contact with and fixed to the backing member B. Therefore, the base end (rotation fulcrum) of the chip BR cannot be forcibly cut off.

[0026] The chips BR, whose base end (rotation fulcrum) has been cut off, are blown to the surroundings by the rotational force of the drill D. In this way, the chips BR generated on the exit side of the drill hole H can be reliably removed.

[0027] 5 to 7 show specific examples of the backing member B as a chip remover. The backing member B shown in Fig. 5 has a support protrusion B1 and a contact portion B2 on the upper portion. The backing member B also has another contact portion B3 on its side.

[0028] The web of the H-shaped steel W has a long horizontal span and is not supported from below. For this reason, the web is prone to bending downward when drilling holes H in the web. If the web bends downward, the drilling accuracy of the drill holes H may decrease or the drill D may break.

[0029] Therefore, a support protrusion B1 is formed on the backing member B. This support protrusion B1 can press the outlet side peripheral edge of the drill hole H to prevent the web of the H-shaped steel W from bending downward.

[0030] This improves the machining accuracy of the drill hole H and prevents damage to the drill D. It goes without saying that the height of the supporting protrusion B1 is set to be the same as the above-mentioned gap CL.

[0031] A contact portion B2 is formed around the support protrusion B1. The tip of the chip BR is brought into contact with the contact portion B2 to remove the chip BR.

[0032] 6 shows an example in which a backing member B serving as a chip removal device is supported on a drill head Hd. The drill D and backing member B can be held exchangeably by an automatic tool changer ATC of this device.

[0033] By replacing the drill D supported by the chuck C of the drill head Hd with the backing member B, the chips BR generated during drilling of the flange of the H-shaped steel W can be removed by abutting them against the contact portion B3 of the backing member B, as shown in Figures 7(a) and (b).

[0034] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible. For example, the backing member B can be held by the drill head Hd, or can be disposed at the exit side of the drill hole as a dedicated plate-shaped jig. In addition, the portion of the backing member B that the tip of the chip BR abuts on is not limited to a flat surface, and can have any shape, such as an inclined surface or a curved surface, as long as the angle θ of the disk-shaped chip BR is less than 90 degrees. [Explanation of symbols]

[0035] B: Supporting part (chip removal device) B1: Support protrusion B2: Reaching part B3: Reaching part C: Chuck CL: Gap D: Drill DM: Diameter H: Drill hole Hd: Drill head W: H-shaped steel (workpiece) Wa: Oxide film

Claims

1. A chip removal device for removing disk-shaped chips that are generated on the outlet side of a drill hole when drilling a hole in a workpiece, characterized in that the chip removal device has a stop member that abuts against the disk-shaped chips on the outlet side of the drill hole.

2. 2. The chip removal device according to claim 1, wherein the disk-shaped chip contacts the backing member at an outlet side of the drill hole in a state in which the chip opens at an acute angle.

3. 3. The chip removal device according to claim 1, wherein a gap between the exit side of the drill hole and the backing member is a distance that suppresses an opening angle of the disk-shaped chips to less than 90 degrees.

4. 2. The chip remover according to claim 1, wherein the contact member has a contact portion against which the disk-shaped chip contacts, and a support protrusion that contacts the periphery of the exit side of the drill hole.

5. A chip removal method for removing disk-shaped chips that are generated on the outlet side of a drill hole when drilling a workpiece, the chip removal method comprising: abutting a stop member against the disk-shaped chips at the outlet side of the drill hole.

6. 6. The chip removal method according to claim 5, wherein the disk-shaped chip contacts the backing member at the exit side of the drill hole in a state in which the disk-shaped chip opens at an acute angle.

7. 7. The chip removal method according to claim 5, wherein a gap between the exit side of the drill hole and the backing member is set to a distance that suppresses an opening angle of the disk-shaped chips to less than 90 degrees.

8. 6. The chip removing method according to claim 5, wherein the contact member has a contact portion against which the disk-shaped chip contacts, and a support protrusion that contacts the periphery of the exit side of the drill hole.

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